diff --git a/README b/README
index bc3586c..22a2f0b 100644
--- a/README
+++ b/README
@@ -17,4 +17,4 @@ the config.toml file is created in your current working directory on the first
 run of metasearch2. alternatively, you can copy the default-config.toml in the
 repo and rename it to config.toml.
 
-the default port is port 28019.
+the default port is 28019.
diff --git a/src/engines/answer/numbat.rs b/src/engines/answer/numbat.rs
index 4af9f36..661a29c 100644
--- a/src/engines/answer/numbat.rs
+++ b/src/engines/answer/numbat.rs
@@ -93,7 +93,8 @@ fn interpret(query: &str) -> Option<(Statement, Markup)> {
         CodeSource::Text,
     ) {
         Ok(r) => r,
-        Err(_) => {
+        Err(err) => {
+            eprintln!("numbat error: {}", err);
             return None;
         }
     };
@@ -185,10 +186,15 @@ pub static NUMBAT_CTX: Lazy<numbat::Context> = Lazy::new(|| {
     // (the lowercase alias code won't work for these because they have prefixes)
     for (alias, canonical) in &[
         ("kb", "kB"),
+        ("kib", "KiB"),
         ("mb", "MB"),
+        ("mib", "MiB"),
         ("gb", "GB"),
+        ("gib", "GiB"),
         ("tb", "TB"),
+        ("tib", "TiB"),
         ("pb", "PB"),
+        ("pib", "PiB"),
     ] {
         let _ = ctx.interpret(&format!("let {alias} = {canonical}"), CodeSource::Internal);
     }